US3707894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic fastener driving tool
Assignee: Gardner Denver Inc
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Filing: 1971-02-10
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Granted: 1973-01-02
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Expires: 1991-02-10
Abstract
Abstract A magnetically attractable threaded fastener is retained in driving engagement with a driving tool by a first permanent magnet, and a magnetically attractable washer is retained on the fastener adjacent the head of the fastener by a second permanent magnet which surrounds both the driving tool and the first permanent magnet. The driving tool may be in the form of a bit for receiving a fastener having a recessed head or may be in the form of a socket for receiving a fastener having a polygonal shaped head.
Inventors
- 👤 G Stillwagon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/02; B25B23/08; B25B23/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A rotatable fastener driving magnetic tool adapted to retain a magnetically attractable threaded fastener and washer assembly, comprising a tool member having means for receiving the head of the fastener in driving engagement, a first inner magnet positioned to attract the fastener and to retain it in said driving engagement with said tool member, a separate outer magnet surrounding said tool member in radially-spaced relation with said inner magnet and in position to attract the washer mounted on the fastener and to retain the washer in a predetermined position on the fastener.
Claim 2
Dependent Claim
92 words
A rotatable fastener driving magnetic tool adapted to retain a magnetically attractable threaded fastener and washer assembly, comprising a tool member having means for receiving the head of the fastener in driving engagement, a first inner magnet positioned to attract the fastener and to retain it in said driving engagement with said tool member, a separate outer magnet surrounding said tool member in radially-spaced relation with said inner magnet and in position to attract the washer mounted on the fastener and to retain the washer in a predetermined position on the fastener.
Claim 3
Dependent Claim
71 words
A magnetic tool as defined in claim 1 wherein said engaging means of said tool member comprise a socket opening within said tool member, said inner magnet comprises a permanent magnet positioned substantially concentric with said socket opening, and said outer magnet comprises an annular thickness oriented magnet mounted on said tool member and an annular sleeve surrounding said annular magnet and forming an outer pole piece for said annular magnet.
Claim 4
Dependent Claim
65 words
A magnetic tool as defined in claim 1 wherein said engaging means of said tool member includes a screw driving bit, said inner magnet comprises an annular magnet mounTed on said screw driving bit, an annular intermediate sleeve surrounding said annular magnet, and said second magnet comprises a second annular magnet surrounding said intermediate sleeve and an annular outer sleeve surrounding said second annular magnet.
Claim 5
Dependent Claim
47 words
A magnetic tool as defined in claim 3 including means for adjusting said annular intermediate sleeve axially relative to said screw driving bit, and means for adjusting said annular outer sleeve axially relative to said annular intermediate sleeve for accommodating fastener and washer assemblies of different configurations.
Claim 6
Dependent Claim
23 words
A magnetic tool as defined in claim 3 wherein said first and second annular magnets each comprise a thickness oriented elastomeric strip magnet.
Claim 7
Dependent Claim
103 words
A rotatable fastener driving magnetic tool adapted to retain a magnetically attractable threaded fastener and washer assembly, comprising a tool member having means for receiving the head of the fastener in driving engagement, inner magnetic means positioned within said tool member to attract the fastener and retain it in said driving engagement with said tool member, an outer thickness oriented elastomeric strip magnet in the form of a cylinder surrounding said tool member in radially-spaced relation with said inner magnetic means, and a tubular sleeve surrounding said strip magnet and cooperating herewith to retain the washer in a predetermined position on the fastener.
Claim 8
Dependent Claim
103 words
A rotatable fastener driving magnetic tool adapted to retain a magnetically attractable threaded fastener and washer assembly, comprising a tool member having means for receiving the head of the fastener in driving engagement, inner magnetic means positioned within said tool member to attract the fastener and retain it in said driving engagement with said tool member, an outer thickness oriented elastomeric strip magnet in the form of a cylinder surrounding said tool member in radially-spaced relation with said inner magnetic means, and a tubular sleeve surrounding said strip magnet and cooperating herewith to retain the washer in a predetermined position on the fastener.
Claim 9
Dependent Claim
43 words
A magnetic tool as defined in claim 6 wherein said inner magnetic means comprise a bar magnet positioned concentrically within said tool member, and a non-magnetic tubular sleeve is positioned between said bar magnet and said tool member for retaining said bar magnet.
Claim 10
Dependent Claim
68 words
A magnetic tool as defined in claim 6 wherein said inner magnetic means comprise an inner thickness orientated elastomeric strip magnet in the form of a cylinder and surrounding said tool member, and an intermediate sleeve is positioned between said inner strip magnet and said outer strip magnet and forms both an outer pole piece for said inner magnet and an inner pole piece for said outer magnet.
References Cited (Backward Citations)
US3007504A
Cited
US3392767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |